111112021081 has 2 divisors, whose sum is σ = 111112021082. Its totient is φ = 111112021080.

The previous prime is 111112021073. The next prime is 111112021093. The reversal of 111112021081 is 180120211111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110569550400 + 542470681 = 332520^2 + 23291^2 .

It is a cyclic number.

It is not a de Polignac number, because 111112021081 - 2³ = 111112021073 is a prime.

It is a super-2 number, since 2×111112021081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111112021781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55556010540 + 55556010541.

It is an arithmetic number, because the mean of its divisors is an integer number (55556010541).

Almost surely, 2^111112021081 is an apocalyptic number.

It is an amenable number.

111112021081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111112021081 is an equidigital number, since it uses as much as digits as its factorization.

111112021081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111112021081 its reverse (180120211111), we get a palindrome (291232232192).

The spelling of 111112021081 in words is "one hundred eleven billion, one hundred twelve million, twenty-one thousand, eighty-one".